I wonder at how pathetic someone's life has to be to not only create new $2m alt accounts to top leagues on % but to see someone else rise consistently & say let me keep it mediocre & remove them (or to deny entry) so I have a better chance of winning (a virtual ego boost yay!). Heck I would have quit the leagues if the admins honestly admitted to this. There are a few sporting admins out there too though who don't indulge in such childish prattle.
Regardless, just give users the option of removing a league from their list if they're no longer members.